I put the REO, batteries, and A7 in separate ziploc bags inside a plastic box with a copy of the REO documentation. Put my
juice bottles in another bag for the tray through the checkpoint. As the carry-on bag went through, the agent stopped briefly, looked over at me, and said, "electronic cigarette?" I nodded my confirmation, and went on my merry way.
I checked my bag on the way back, and it got opened and searched by TSA, who left their standard note in the bag. So overall, they had some curiosity, but no problems though.
Thanks again everyone!